usr/src/cmd/px/h04aout.h

/*
 * Format of an a.out header
 */

struct  exec {  /* a.out header */
        int             a_magic;        /* magic number */
        unsigned        a_text;         /* size of text segment */
        unsigned        a_data;         /* size of initialized data */
        unsigned        a_bss;          /* size of uninitialized data */
        unsigned        a_syms;         /* size of symbol table */
        unsigned        a_entry;        /* entry point */
        unsigned        a_trsize;       /* size of text relocation */
        unsigned        a_drsize;       /* size of data relocation */
};

#define A_MAGIC1        0407            /* normal */
#define A_MAGIC2        0410            /* read-only text */
#define A_MAGIC3        0411            /* separated I&D */
#define A_MAGIC4        0405            /* overlay */